OO-2163 use thicker icon for custom cell render to better distinguish between list and custom table

src/main/java/org/olat/core/gui/components/form/flexible/impl/elements/table/FlexiTableElementImpl.java

@@ -223,7 +223,7 @@ public class FlexiTableElementImpl extends FormItemImpl implements FlexiTableEle
 			//custom
 			customTypeButton = new FormLinkImpl(dispatchId + "_customRTypeButton", "rCustomRTypeButton", "", Link.BUTTON + Link.NONTRANSLATED);
 			customTypeButton.setTranslator(translator);
-			customTypeButton.setIconLeftCSS("o_icon o_icon_list o_icon-lg");
+			customTypeButton.setIconLeftCSS("o_icon o_icon_table_custom o_icon-lg");
 			customTypeButton.setActive(FlexiTableRendererType.custom == rendererType);
 			components.put("rTypeCustom", customTypeButton);
 			//classic tables

src/main/webapp/static/themes/light/modules/_icons.scss

@@ -255,6 +255,7 @@ $fa-css-prefix: "o_icon" !default;
 .o_icon_statistics_tool:before { content: $fa-var-bar-chart-o;}
 .o_icon_submit:before { content: $fa-var-check; }
 .o_icon_table:before { content: $fa-var-table; }
+.o_icon_table_custom:before { content: $fa-var-th-list; }
 .o_icon_table_large:before { content: $fa-var-th-large; }
 .o_icon_tags:before { content: $fa-var-tags; }
 .o_icon_timelimit:before { content: $fa-var-bomb; }